I2S amplifier MAX98357 is a high-efficiency Class D power amplifier3.2W Class AB amplifier sound quality, I2S protocol, PCM encodingMaster clock: no master clock (MCLK) requiredPlug and play: only a single power supply is needed to automatically configure 35 different clocks and 128 digital audio formats, 2.5V-5V DC power supplySuitable for , for and ESP32 and other microcontrollers or development board systems with I2S audio outputNote: due to different production batches, the product appearance and printed words be different, which not affect the use.Output power:3.2W at 4Q, 10%1.8W at 8Q, 10%I2S sampling rate: 8kHz-96kHzClass D amplifier gain selectable: 3dB/6dB/9dB/12dB/15dBColour:BlueMaterial:PCBPackage Contents:1 * Power Amplifier Module KitOnly the above package content, other products are not included.Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.